Doppler-free ultraviolet excitation spectra of CΠ1<sub>u</sub>−XΣ1g+ in Na<sub>2</sub> by modulated population spectroscopy

G.-Y. Yan; B. W. Sterling; T. Kalka; A. L. Schawlow

doi:10.1364/JOSAB.6.001975

Journal of the Optical Society of America B
Vol. 6,
Issue 11,
pp. 1975-1978
(1989)
•https://doi.org/10.1364/JOSAB.6.001975

Doppler-free ultraviolet excitation spectra of $C {{}^{1}Π}_{u} - X {{}^{1}Σ}_{g}^{+}$ in Na₂ by modulated population spectroscopy

G.-Y. Yan, B. W. Sterling, T. Kalka, and A. L. Schawlow

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G.-Y. Yan, B. W. Sterling, T. Kalka, and A. L. Schawlow, "Doppler-free ultraviolet excitation spectra of CΠ1_u−XΣ1g+ in Na₂ by modulated population spectroscopy," J. Opt. Soc. Am. B 6, 1975-1978 (1989)

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Abstract

The C¹Π_u state of Na₂ has been studied in detail by cw UV Doppler-free excitation spectra from its ground state, simplified by modulated population spectroscopy. 270 levels of e parity and 180 levels of f parity with 11 ≤ υ ≤ 35 and 8 ≤ J ≤ 70 were measured with high resolution. The observations reveal that many of the e levels with 15 ≤ υ ≤ 24 are perturbed. A likely candidate for the perturbing state is the $(3) {{}^{1}Σ}_{u}^{+}$ state. A set of Dunham coefficients was deduced to fit the spectroscopic data after deperturbation and used to construct the Rydberg–Klein–Rees potential for the C¹Π_u state. In addition, Λ-type doubling of the state was observed directly.

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Y₁₀ = 1.165936E2 (2.7e − 2)	Y₀₂ = −5.070452E − 7 (5.3e − 9)
Y₂₀ = −6.694904E −1 (3.8e − 3)	Y₁₂ = 2.0695175E − 9 (2.2e − 10)
Y₃₀ = 9.9059784E − 4 (2.4e − 5)
Y₄₀ = 1.3201365E − 4 (7.0e − 6)	Y₀₃ = 3.1720898E −12 (2.2e −13)
Y₅₀ = −1.796947E − 6 (7.6e − 8)
Y₀₁ = 1.1672307E − 1 (3.5e − 5)	Δq₀ = 1.6869E − 4
Y₁₁ = −9.525076E − 4 (6.4e − 6)	Δq₁ = −0.266744E − 4
Y₂₁ = 4.1082414E − 6 (4.7e − 7)	Δq₂ = 1.4443339E − 6
Y₃₁ = 3.6991288E − 8 (1.1e − 8)	Δq₃ = −2.2602288E − 8

R(Å)	T_e (cm⁻¹)	R(Å)	T_e (cm⁻¹)
2.60	33285.41	4.20	30277.90
2.80	31686.24	4.40	30614.41
3.00	30604.68	4.60	30974.02
3.20	29969.08	4.80	31342.74
3.40	29677.14	5.00	31716.55
3.545	29621.66	5.20	32091.00
3.60	29628.57	5.40	32465.84
3.80	29758.86	5.60	32836.26
4.00	29979.12	5.80	33198.69

Y₁₀ = 1.165936E2 (2.7e − 2)	Y₀₂ = −5.070452E − 7 (5.3e − 9)
Y₂₀ = −6.694904E −1 (3.8e − 3)	Y₁₂ = 2.0695175E − 9 (2.2e − 10)
Y₃₀ = 9.9059784E − 4 (2.4e − 5)
Y₄₀ = 1.3201365E − 4 (7.0e − 6)	Y₀₃ = 3.1720898E −12 (2.2e −13)
Y₅₀ = −1.796947E − 6 (7.6e − 8)
Y₀₁ = 1.1672307E − 1 (3.5e − 5)	Δq₀ = 1.6869E − 4
Y₁₁ = −9.525076E − 4 (6.4e − 6)	Δq₁ = −0.266744E − 4
Y₂₁ = 4.1082414E − 6 (4.7e − 7)	Δq₂ = 1.4443339E − 6
Y₃₁ = 3.6991288E − 8 (1.1e − 8)	Δq₃ = −2.2602288E − 8

R(Å)	T_e (cm⁻¹)	R(Å)	T_e (cm⁻¹)
2.60	33285.41	4.20	30277.90
2.80	31686.24	4.40	30614.41
3.00	30604.68	4.60	30974.02
3.20	29969.08	4.80	31342.74
3.40	29677.14	5.00	31716.55
3.545	29621.66	5.20	32091.00
3.60	29628.57	5.40	32465.84
3.80	29758.86	5.60	32836.26
4.00	29979.12	5.80	33198.69

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Journal of the Optical Society of America B